package com.fc.app.fcapp.recyclerview;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.LinearLayout;

/**
 * Created by fc on 2018/2/25.
 * <p>
 * 实现自定义分割线
 */

public class DividerItemDecoration extends RecyclerView.ItemDecoration {
    private int mOrientation;
    private Drawable mDivider;
    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };

    public DividerItemDecoration(Context context, int orientation) {
        final TypedArray typedArray = context.obtainStyledAttributes(ATTRS);
        mDivider = typedArray.getDrawable(0);
        typedArray.recycle();
        setOrientation(orientation);
    }

    private void setOrientation(int orientation) {
        if (orientation != LinearLayout.VERTICAL && orientation != LinearLayout.HORIZONTAL) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        if (mOrientation == LinearLayout.VERTICAL) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }
    }


    public void drawVertical(Canvas canvas, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(canvas);
        }
    }

    public void drawHorizontal(Canvas canvas, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(canvas);
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        if (mOrientation == LinearLayout.VERTICAL) {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());//获取固定高度
        } else {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }
}
